briggs



I. J. BRIGGS. LUBRIGATINGGUP.

(Ne Model.)

No. 482,674. Patented Sept. 13, 1892.

UNITED STATES PATENT OFFICE.

IRA J. BRIGGS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE-HALF TO A. W. SANBORN, OF SAIWIE PLACE.

LUBRICATINGi-CUP.l

SPECIFICATION forming part of Letters Patent No. 482,674, dated September 13, 1892.

Application filed December 26, 1891. SerialNo. 416,228. (No model.)

To all whom, t may concern.'

Be it known that I, IRA J. BRIGGS, a citizen of the United States, residing in the city and county of San Francisco, State of California,

have invented an Improvement in Lubricating-Cups; and I hereby declare the following to be a full, clear, and eXact description of the same.

My invention relates to an improved lubril0 eating-cup which is especially useful upon engine-cylinders and in other places where there is a pressure of gas or vapor against which the oil or lubricating material is to be introduced.

It consists in certain details of construction which will be more fully explained by refer ence to the accompanying drawing, in which the figure is a vertical cross-section through my cup.

A is a lubricating-cup of any desired construction. In the present case it represents a glass cup having a central passage B, through which oil passes downwardly. In the lower part of this passage is a valve C, which opens 2 5 downwardly and allows the oil to tlow out and is closed upwardly by any pressure from below. While this valve would allow the oil to low from the cup when there was no pressure or an intermittent pressure, it would not al- 3o low any flow of oil in case the pressure from below was continuous. I have therefore shown a valve-stem D, having a valve E upon its upper end and a valve F upon its lower end. This stem,with its valves, is contained in a chamber G, formed in an extension or prolongation of the cup,whereby the chamber G lies below the chamber H, in which the valve C is contained, and forms a continuation thereof.

In the upper part ot' the chamber Gis a seat, against which the valve E closes upwardly when any pressure is brought to bear upon it from below. In the lower part of this charnber G is a seat, against which the valve F at the lower end of the stem closes when the valve is pressed downward.

In the present case I have shown my valvecup as applied to an ordinary steam-engine with a horizontal cylinder. One of these cups 5o will be attached to each end of the cylinder. Vhen the steam is admitted to one end of the cylinder, the pressure acting from below raises the valve F, enters the chamber G, and closes the valve E. Vthile this valve is closed there is no pressure in the chamber H which contains the valve C, and the latter will drop by gravitation, thus allowing a portion ot' the oil in the cup A to flow into the chamber H above the valve E.

The valve-stem D is surrounded byaspiral 6c spring I. The lower end of this spring presses' upon the top of the valve F. The upper end is sufficiently larger than the valve E to allow it to abut against the upper part of the interior of the chamber G. This spring has sufficient tension to force the valve-stem D down, so that the valve F will be seated over the passage entering the cylinder and the valve E will correspondingly be opened whenever the pressure which forces the piston to one 7o end of its stroke is relieved. This occurs as soon as the admission-valve is closed; but without the spring I these valves would not open, because there is always a little backpressure in the cylinder due to the exhauststeam,which cannot be forced out without this back-pressure. The spring I is stili enough to overcome this pressure, and thus when the valves are relieved from the direct boilerpressure this spring forces the valves E and F 8o down, closing the passage to the cylinder and opening the passage into the chamber H. This allows any oil wit-hin the chamber H to fiow into the chamber G, and when the valves F. F are again raised the valve E closes the passage to the chamber H, and any oil within the chamber G is allowed to pass down through the passage into the cylinder. In this manner my lubricator becomes automatic without any chance for the escape of steam through it.

Having thus described myinvention,what I claim as new, and desire to secure by Letters Patent, is

1. A lubricator-cup having the opening and extensionbelowandanupwardlyfclosingvalve 95 which opens by gravitation when relieved of pressure and closes when pressure is applied from below, whereby oil is admitted into the valve-chamber from the cup when the valve is opened, said extension having a second 10o chamber containing a double ended valve situated below the rst one, one of the valves closing upwardly when exposed to pressure from below and the other closing downwardly when exposed to pressure from above, substantially as herein described.

2. A lubricating cup having the passage and chamber below the bottom of the cup, a valve situated Within said chamber, closing upwardly when exposed to pressure from below and opening by gravitation to allow oil to flow into its chamber, an extension from said cup having a second chamber situated below and communicating with the irst named chamber, a valve-stem within said chamber, having an upWardly-closin g valve at the lower end, and a spring surrounding the valve-stem, actin g to close the lower valve, whereby the upper valve is closed when exposed to pressure from below and the lower valve is closed and the upper valve opened by the action 0f the spring when relieved from pressure from below, substantially as herein described.

In witness whereof I have hereunto set my hand.

IRA J. BRIGGS.

Witnesses:

S. I-I. NoURsE, AH. F. ASCHECK. 

